Fuse.



No. 835,618. PATENTED NOV. 13, 1906. 0. G. HOFFMANN.

FUSE.

APPLICATION FILED FEB. 26. 1904.

UNITED STATES PATENT OFFICE.

OTTO C. HOFFMANN, OF CHICAGO, ILLINOIS, ASSIGNOR TO WILLIAM \V. MERRILL,OF CHICAGO, ILLINOIS.

FUSE

Specification of Letters Patent.

Application filed February 26, 1904. Serial No. 195,348.

. ing is a specification.

, My invention relates to fuses.

v I wish to produce an inclosed fuse capable of varlous uses, economical111 its manufacture, and efficient.

I have illustrated my invention by the ac companying drawings, whereinFigure 1 is a side elevation with parts Fig. 2, a plan View; Figs. 3 and4, v ews of t e terminal blank; Fig. 5, a crosssectlon through theterminal tube; Fig. 6, a side elevation with parts broken away of anincomplete fuse, and Fig. 7 is an elevation of a complete fuse.

A 1s a block on which are mounted two terminal plates B B, associatedwith screws C C, whereby the circuit-wires may be connectedto theseterminals.

Arising from the terminals B B are the spring portions D D, adapted toclamp between them the flattened ends of the fuse. I

11B is a tube of glass or other suitable materia F 1s a blank ofcoppershaped as shown. Such blanks may be cut out of continuous strips orplates without loss of material. At one end of the blank is a projectionG, which is preferably first turned up into the position 1n icated 1nFig. 4 substantially at a right angle to the body of the blank. This maybe done by guttmg the piece G into a slot in an arbor an then bendingthe blank around the arbor, so as to form the tube H with theinwardly-pro ecting piece G, which now becomes e for the end of the tubeE, as indlcated 1n ig. 6. The parts will be brought together after theterminaltubes are so made 1n the manner indicated at Fig. 6, and theyw1ll be cemented at J. The fuse-wire K may now be passed through thethree tubes so arranged, whereupon the metal tubes may be flattened attheir ends beyond the glass tube to form the finished fuse illustratedin Figs. 1, 2, and 7. These flattened ends are suitable to be insertedbetween the spring-pieces D D, whereupon the circuit is made through thelnclosed fuse-wires. If-the fuse is to be attached in some other manner,slots L or M may be stamped in the flattened ends, so as to permit suchattachment.

It will be readily understood that I do not wish to limit myself to anyparticular size, shape, or proportion of the several arts or to the useof any particular materia s, though what I have illustrated in Figs 1and 2 is two line-terminals of spring-brass, two fuse-terminals of thincopper sheet, a glass-inclosing tube, and the usual fuse-wire.

The use and operation of my invention is apparent. I may, however,briefly refer to some of its peculiarities, advantages, and to the meansby which it is produced.

By firmly flattening the ends of the fuseterminals the fuse-wire isgrasped between them without the need of solder or the like. Moreover,the fuse-wire is firmly and securely protected. These flattened endsshould now e tightly clamped, as by the spring-pieces of Figs. 1 and 2,or by the clamping-screws passed through the slots. (Illustrated in Fig.7.) This holds the flattened sides of the terminal together and makesapermanent contact between the fuse-wire and the fuse-terminals withoutthe use of solder orother means of securing the parts together. The endsshould be flattened at a distance from the endsof the glass tube, so asto avoid breaking the latter. The fuse-terminal extends beyond theglass, and therefore in clamping or attaching the same it is unnecessaryto put any pressure upon the inclosing tube. The flat terminalsobviously present a greater width than the diameter of the tube, andtherefore they furnish a convenient means of attaching the fuse withoutbringing the glass of the tube into contact with any of the supportingparts.

The fuseewire is entirely inclosed, but has a free air space or chamber.In the process of manufacture, as above outlined, the tubularfuse-terminals are provided with an inward stop, which can be made inany desired way, and I have shown but one, against which the ends of thetubes rest. Thus I obtain terminals of uniform length. Of course thefuse-wire could be attached inother ways and the arts could be soldered,or the fuse- Wire coufii be brought through the terminal and theresoldered. What I have shown seems to be the most convenient and leastexpensive method of carrying out my invention. Among other things thisconstruction per- Patented Nov. 13, 1906.

mits me to use a tube with a fuse-wire passing substantially along theaxis of the tube, because I have terminals which roject beyond the endsof the tube lie partially in the plane of the axis thereof, and to themthe se-wire is attached beyond the ends of the tube.

I claim 1. A fuse com rising a tube with flattened tubular terminalsinclosing the ends of the tube, such flattened portions of the terminalsbeing wider than the diameter of the tube, a fuse passing through thetube and connected to the terminals and a stop within the tubular partof each of the terminals between the end of the tube and the flattenedend of the terminal.

2. A fuse comprising a tube, two terminals,

, one at each end, each terminal having a fiattened portion beyond theend of the tube and a stop to abut the tube, such stop being aprojection from the wall of the terminal extending inwardly therefromand a fuse within the tube and connected to the terminals.

3. A fuse comprising a tube, two terminals each having three arts, one atubular part to inclose the end of the tube, another a fiattened portionprojecting beyond the tube, and the third a sto within the tubular partto abut the end of t e tube within the terminal, and a fuse within thetube and attached to the terminals. 4. A fuse comprising a tube,afusible conductor, devices to support such tube and part to the end ofthe tube, another a flattened portion projecting beyond the tube, andthe" third a stop comprising a portion of the "terminal projectingbeyond the tubular part to abut the end of the tube and a fuse Withinthe tube, and attached to the terminals.

6. A fuse com rising a tube with flattened tubular termina s biting theends of the tube, such flattened portions of the terminals being Widerthan the diameter of the tube, a fuse passing through the tube andconnecting with the terminals, and a stop forming a part of the terminalfor preventing the terminal from engaging the tube too far from itsextremity located between the tubular portion and the flat part of theflattened end;

7. A fuse com rising a tube with flattened tubular termina s biting theend of the tube, such flattened portions of the terminals being widerthan the diameter of the tubular portion of the terminal, a fuse passingthrough the tube and connecting with the. terminals and a stop forming apart of the terminal for preventing the terminal from engaging the tubetoo far from its extremity located be tween the tubular ortion and theflat part of the flattened end? 8; A fuse comprising a tube withflattened tubular terminals biting the ends of the tube,

such flattened portions of the terminals being wider than the diameterof the tube, a fuse passing through the tube and connecting withtheterminals, and a stop forming a part of the terminal for preventing theterminal from engaging the tube too far from its extremity and cementbetween the terminal and the tube.

OTTO o. HOFFMANN.

Witnesses:

HOMER L. KRAFT, ANSON B. SWEET.

